Data is stored on the hard disc. The more memory hard disc has the more data can be stored.
A standard single-layer Blu-ray disc holds about 25 GB of data, while a dual-layer disc can hold around 50 GB. Therefore, in 1 terabyte (1,000 GB), you could store approximately 40 single-layer Blu-ray discs or about 20 dual-layer discs. This calculation can vary slightly based on the actual usable capacity of the storage medium.
a File
This type of storage is called optical storage. Data is stored by encoding information as microscopic light and dark spots on the disc surface, which can be read by a laser beam in devices such as CD-ROMs, DVDs, and Blu-ray discs.
CDs and DVDs both use a storage technique called optical storage. The data is stored on the discs by burning microscopic holes on the exterior of the disc, invisible to the naked eye. CD and DVD readers then perceive these holes as data and displays it to the user or computer. This is why you "Burn" something onto a CD/DVD.
5 times more data. A Blu-Ray's maximum storage data is 50GB
magnetic disc
A Blu-ray disc is primarily made of polycarbonate plastic, which serves as the substrate. It has a reflective layer of aluminum or silver to help read the data, and a protective coating is applied to prevent scratches and damage. The data is stored in the form of pits and lands on the disc surface, allowing for high-density storage.
A floppy disc is an old form of data storage device, so the answer would be CD's, DVD's and data sticks.
so you dont lose it......... . . . .
optical storage technology
Digital Video Disc or Digital Versatile Disc DVD ("Digital Versatile Disc", often incorrectly explained as "Digital Video Disc") is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality.